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The short answer
What to study depends on your starting point: your last qualification, your stream and marks, your interests and your budget. Pick your situation below for the options and the routes that lead to them. Whatever you choose, confirm admission rules, fees and recognition at the official source before you commit.
Admission rules change; confirm with the official notice.
Start from your situation, not from the course list
Lists of "top courses" mislead because they ignore where you are starting. A Class 10 student, a graduate in commerce and a diploma holder have different doors open. A course that is excellent for one may be closed to another, or poorly suited.
The pages below are organised by situation. Each one describes the realistic options, the entry route for each, what the course demands and what to verify. They also say plainly when something depends on factors that change, such as cut-offs, exam patterns or regulations, and point you to the official site.
If you are not sure which situation you are in, begin with the stage that matches your latest completed qualification. Then use the interest and constraints you have to narrow the list.